Package JSON fix (#30)

* Change how version string is loaded from package.json

package.json

@@ -22,6 +22,7 @@
     "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
   },
   "files": [
+    "package.json",
     "dist"
   ],
   "scripts": {

src/constants.ts

@@ -3,7 +3,12 @@
 //
 // SPDX-License-Identifier: MIT
 
-import { version } from '../package.json';
+import fs from 'fs';
+import path from 'path';
+
+const pkg = JSON.parse(
+  fs.readFileSync(path.join(__dirname, '../package.json'), { encoding: 'utf-8' })
+);
 
 export const CLIENT_ID_LENGTH = 20;
 export const CLIENT_SECRET_LENGTH = 40;
@@ -14,7 +19,7 @@ export const JTI_LENGTH = 36;
 export const JWT_EXPIRATION = 300;
 export const JWT_LEEWAY = 60;
 
-export const USER_AGENT = `duo_universal_node/${version}`;
+export const USER_AGENT = `duo_universal_node/${pkg.version}`;
 export const SIG_ALGORITHM = 'HS512';
 export const GRANT_TYPE = 'authorization_code';
 export const CLIENT_ASSERTION_TYPE = 'urn:ietf:params:oauth:client-assertion-type:jwt-bearer';